Quartz-mill.



No. 860,747. PATENTED JULY 23, 1907.

G- B. HUMPHRBYS.

. QUARTZ MILL. nrmunron Hum 1:20.21, 1905.

1 sums-sum 1.

Charles Mumpkrqy;

awry

mom a PATENTER JULY 23, 1907.

C. E. HUMPHREYS.

QUARTZ MILL. APPLIOATION FILED DIE-0.27, 1906.

7 SHEETS-SHEET 2.

INVENTOR liarlesif lzagofirqygy.

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No. 860,747. PATENTED JULY 23, 1907. O. E. HUMPHREYS.

QUARTZ MILL.

APPLIOATION FILED DBO. 27, 1905.

7 SHEETS-SHEET 8.

WITNESSES:

@ AMWM Q M Arm/WEN PATENTED JULY 23, 1907.

C. E. HUMPHREYS.

QUARTZ MILL.

APPLICATION FILED 1120.27, 1905.

7 SHEETS-SHEET 4.

I N VE N 70/? lzarleszjfam A TTORNEKS PATENTED JULY 23, 1907. G. B.HUMPHREYS.'

QUARTZ MILL.

APPLICATION FILED DBO. 27, 1905.

7 SHEETS-SHEET 5. 1 5- 2 7 a 2 a3 W/TNESSES: 3 ZPIIVVEIVTOResl'lfizmpbnys .W. g w 8, f '6 0 wrrommar No. 860,747, PATENTED JULY 23,1907.

L c. E. HUMPHREYS.

QUARTZ MILL.

APPL'IUATION FILED 01mm, 1905.

' TSHEETS-SHEET e.

FT I r m Z g WITNESSES: IIVVEIVTOR UNITED STATES PATENT OFFICE.

QUARTZ-MILL.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed December 27, 1905. Serial No. 293,497."

To all whom it may concern:

Be it known that 1, CHARLES E. HUMPHREYS, residing at Walker, in thecounty of Siskiyou and State of California, have invented certain newand useful Improvements in Quartz-Mills, of which the following is aspecification.

My invention relates to certain new and useful improvements in quartzmills and the like, andit particularly relates to improvements ingrinding and crushing mills-of the rotary type.

Primarily, my invention has for. its object to provide a mill of asimple and effective construction which is particularly adapted for thereduction of gold bearing ores and .which will be effective andeconomical in itsoperation. V

Again, my invention has for its object to provide a mill of thischaracter embodying the essential crushing characteristics of a stampmill and the pulverizing and grinding features of an arrastre, differingfrom the latter, in that my mill disposed vertically while the arrastreis disposed horizontally.

Generically, my invention includes certain new and useful improvementson the improvement disclosed in my-Patent No. 769610, of September 6,1904.

In its more detailed nat e, my invention includes improved hammer devics and improved means c0- operating with the hammers for causing them toperform a uniform grinding or pulverizing action on the material duringtheir entire active movement.

The invention also includes an improved form of feeding mechanism forfeeding the material to the crusher anvil and an improved means foradjusting such feeding means. 7

Again, my invention includes means cooperating with the journal of themain shaft whereby the shaft can be so adjusted as to insure the properdistance between the dies and the grinding shoe at all times to allowfor wear on the shoes.

In this inventionl also provide improved pockets'on each side of the dieof the mortar for receiving amalgam and means carried by the die forfitting in the amalgam pockets to hold the die stationary.

My present invention also includes improvements in the boxes whereby thefeed water is equally distributed in the milland also keeps any gritwashed clean of the bearings. i

With other objects in view than have been heretofore specified, myinvention also includes certain novel construction, combination andarrangementof parts, all of which will be first described in detail andthen be "specifically pointed out in the appended claims, referencebeing had to the accompanying drawings, in

which:

Figure 1, is a perspective view showing my invention complete. Fig. 2,is a side elevation thereof. 1

pockets 22 are provided on the sides of thechannel 20 to Fig. 3, is acentral vertical longitudinal section of my invention. Fig. 4, is a topplan view of my invention, the housing being removed. Fig. 5, is a topplan view of my invention, the crushing and grinding mechanism beingremoved and showing the mortar in plan view. Fig. 6., is acrosssectionon the line 66 of Fig. 4, looking in the direction of the arrow. Fig. 7,is a central 'longitudinalsection of the mortar. Fig. 8, is a crosssection thereof on the line 88 of Fig. 7. Fig. 9, is a perspective viewof the hammer carrying mechanism, one of the hammer carrying disks beingshown detached. Fig. 10, is' a detail perspective view of the die. Fig.11, is a detail perspective view of one of the bottom bearing boxes.Fig. 12, is a similar view of one of the top bearing boxes. Figs. 13-and14, are respectively, an endelevation and a plan view of the feedtrough. Fig. 15, is a detail view of the reciprocating feed plate: Fig.16, is a detail side elevation of a modified form of mortarshowing thedesign of the same when constructed of a single piece of timber, and isused in lieu of the mortar shown in the remaining figures, which is theform of mortar when the same is to be formed of metal. Fig. 17, is across section on the line 17 17 of Fig.'16.

Referring now to the accompanying drawings in which like numerals andletters of reference indicate like parts in all of the figures, 1designates the mortar which has a supporting base 2 and supporting webs3 formed integrally, the mortar 1 including a bottom 4 curved ina-circular are for a purpose presently understood. v

The sides 5 0f the mortar have bearing-slots 6 and brackets 7 whichlatter project from-the sides of the mortar to support the bearings forthe drive shaft hereinafter again referred to. The sides 50f themortar-have grooves or countersunk portions 8 into which the flanges 9of the upper bearing boxes 10 fit and the bearing boxes 10 have theirprojecting portions 11 arranged to fit in the slots 6. The upper bearingbox 10 has an apbeing provided beneath the bars 14 of the lower bear-'ing boxes for a purpose presently understood. The lower bearing boxes 13have apertures 16 which communicate with the grooves 17 on the innerfaces of the mortar sides adjacent the slots 6. The'sides 5 of themortar have openings 18 normally covered by screens 19, as shown. Themanner of supporting the screens will be presently explained.

The mortar bottom 4 has a central circular channel or depression 20formed with a series of radial pockets 21 in its lower face to receivemercury or other suitable amalgamating material, while supplementalamalgam l apertures 28 to receive the shanks 29 of the worn out hammershoes 30 which fit into the pockets 21, when in position in the die 26,as indicated in Fig. 3. These worn out hammer shoes 30 as shown in Fig.3, form a fastening means between the die 26 and the mortar as r shownand also enable a solid die to be obtained with a minimum amount ofmetal since the material of the worn out hammer shoes is used as plugsto fill the apertures 28 ofthe die 26. The die 26 is also provided witha pair of horizontal apertures 31 to receive a hook or other suitableimplement by means of which the die may be lifted out of and replacedinto the mortar.

The screen 19 is supported in a suitable frame work 39 adapted to slideinto the grooved lugs 40 and are held in place by wedges 41, as shown.When thewedges 41 are removed, the screen 19 can be slid forwardly outof alinement with the aperture in the sides of the mortar to give accessto the amalgam pockets. Troughs 32 and 33 serve to carry the slime as itpasses through the screen toward the front of the machine and to theusual amalgam plates.

' The mortar 1 has an upwardly extending frame work 34 to which the feedt rbugh 42 and the hopper 50 are secured in a manner presently to beexplained.

The feed trough "42 is of approximately triangular shape and is boundedby walls 43 as shown, the trough 42 is centrally apertured as at 44 andprovided with lugs 45 and cross braces 4647 as shown. The cross braces47 being apertured as at 48 to receive the recipro'cating feed plate 60,hereinafter referred to. At the lower forward end the trough 42 has ears49 through the medium of which it is secured to the upwardly projectingportion 34 of the mortar 1.

The feed plate 60 has 'a bridge portion 61 to the rear of which a-buffer62 is secured, while a U-sliaped mem-,

ber 63 is secured at the rear of the bridge portion beneath the upperface of the plate 60 to receive the end 64 of the coil spring 65, whichhas its other end 66 secured to theadjusting rod 67 that passes throughthe cross block 68 on the supplemental supporting frame '69, which frame69 is securedto the mortar 1 by the web 70, the bar 71 and the bearing72 for the bar 71. '11 turn nut 73 having a handle 74 coeperates withthe rod 67 a to adjust the tension of the spring 65 for a purposehereinafter described. 7

The hopper 50 has its lower edge 51 adapted to fit within the walls 43of the feed trough and the front of the hopper'is secured to theupwardly projecting portion34 of the mortar frame at the frontof thefeed trough 42 and above the feed trough 42, a gate 75 is hingedlymounted on a cross bolt 76 carried by the upwardly projecting portion 34of the mortar frame and the gate 75 is limited in its movementv in onedirection, 'by thestops 7 7 on the projecting frame portion 34.

78 designates abracket secured to the rear of the beam 68, which carriesa bufier 79 to coeperate with the lever manner.

80, which is pivotally mounted at 81 on the beam 68 and has one endprovided with an impacting head'82 to cooperate with the buffer 62 onthe feed plate 60. The other end of the lever 80 passes through anaperture 84, in one end of a feed plunger 85, which plunger is looselyheld on the lever 80 by pins 83, as shown.

The feed plunger 85 projects through an aperture 86 I in the slidingblock 87 which is slidable in the guide frame 88 carried by the bracket89 projecting toward the I side of the mortar 1 and carried thereby. Theblock 87 is adjustably held in the guide frame 88 by a feed screw 90,which passes through apertures 91, in the frame 88 and is secured fromlongitudinal movement by collars 92 and is provided with a hand wheel93, as shown. By means of the block 87 and its adjusting mechanism, theplunger can be raised or lowered with respect to the frame 88. for apurpose hereinafter described. The plunger 85 has an impacting head 94at its free end, as shown. I

95 designates the main drive shaft of my machine, I which is mounted toturn in the bearing boxes 10 and 13 85 and the shaft 95 carrieson itsoutwardly projecting end a pulley 96 which is keyed to the shaft in anydesired Mounted on the shaft 95 between the sides 5 of the mortar 1, isa pair of disks 97 which are provided with central hubs 98 arranged tobe held 'onto the shaft to rotate in unison, and the hubs 98 are ofsufficient length to space the disks 97 apart the required distance.

On the inner face of each disk 97 is formed a series of V radiallyequi-distantly spaced lugs 99, of substantially 95 circular form, whichlugs 99 areprovided with heels 100 for a purpose hereinafter described.The lugs 99 have apertures 101 and a counter-sunk portion 102 for apurpose now to be explained. 103 designates the hammer members, which inthe present form of my invention, 100 comprisethe arms 104 and the shoeor head receiving a members 105, which project at right angles to thearm 104 a sufficient distance to form a shoulder 106 for a purposehereinafter described. The hammer head receiving portions have apertures107 to receive the shanks 1 0 5 29 of the hammer heads or shoes 30'whichhammer heads 30 are secured in place by keys 108 so that when the hammerheads 30 are worn out they can be removed and new ones substitutedtherefor.

The arms 104 of the hammers 103 are provided with 110 hubs 109 which areadapted to seat in the counter-sunk portions 102 of the lugs 99 whichportions 102- serve as bearings for the hubs 99 and serve to hold thedisks 97 in proper correlative position as well as the bearing spindlesor shafts for the hammers to ride on. 1 15 Each hammer 103 has the rearend of its arm 104 apertured to receive cross pins 111 and the rear endof each hammer 104 is provided with a lug 112 tostrengthen or back upthe pins 111 to prevent them becoming bent when they engage the heels100 of the lugs 99 on the disks 97. a

Arranged in radial alinement with thev apertures'lOl are a plurality ofapertures 113 in the disks 97 through which bolts114 pass. Upon thebolts 114 is mounted a series of pendulums 115 of apeculiar form and ofa width 1 2 5 nearly equal to the width of the space between the plates97-97 and these pendulums 115 have aperturedhubs 116 to receive bolts114 upwhich they are loosely pivoted;

--The pendulums 115 have heels 117 which engage the hammers 103 at timesto counter-balance the same,

while they also have cam portions 118 to engage the hubs 98 of the disks97, while the heels 117 are in engagement with the hammers. Thependulums 115 also have arms 119 for cooperating with the hammers whenin certain positions to modify theaction of the hammers. The radius ofthe path of the pendulum is not suflicient so that centrifugal forcewill throw them out, and there is no action of the pendulums .on theparticular hammer which is engaged on the striking operation, and thependulums are so arranged as to aid the hammers in distributing an evenpressure on the material that is being ground against the die, theyserving to add to the pressure of the hammers in proportion as thepressure of the hammers is decreased during the corresponding-change intheir angularity.

The mortar 1, in the form of my invention shown in Figs. 1, 2 and 3, ispreferably constructed of cast iron .and cast in one piece.-

ley 96, which collar 121 has a plurality of radial arms 122 spacedequi-distantly apart, and equal in number to the number of hammerscarried by the disks 97 and the arms 122 are adapted to strike the end94 of the plunger to cause 'motion to be imparted thereto, which motionis imparted to the sliding plate 60, to reciprocate the same to causethe plate 60 to carry the contents from-the hopper down under the gate75, which gate 75, on the return movement of the plate 60, wipes the oreoff the plate 60 onto the anvil portion 27* of the die 25, and by reasonof the correlative arrangement of the arms 122 and the plunger 85, suchore will be de their shanks are of considerable value. .To utilize thisotherwise waste material, I construct the hammer heads or shoes andhammers as shown, so that the hammer shoes, when worn can be removed andthe worn out portion of the shoes, can be placed in the amalgam pockets,as before described. The thickness of the dieis nearly equal to thelength of a hammer head or shoe stem, and by havingthe apertures in thedies, and in- I serting the stems up throughthese apertures, and pro-fviding a suitable seat, (the amalgam pockets in thebottom of the mortar)for the protuberant heads of the shoes iii the bottom of the mortar, themill-man is enabled to make use of his old heads or hammer shoes, evenafter they have served their original purpose. The shoes or hammerheads, as before stated, are very hard and the weight supplied by theirstemsjs that much weight saved on the dies.

The die can be made in sections,'as shown in my patent hereinbeforereferred to, if desired.

Having thus described the construction of my present invention, themanner in which it operates will be best explained as follows.

0perat'ion.The ore is placed in the hopper 50 and motion is imparted tothe drive shaft 95 in the direction of the arrow in Fig. 3, thusrotating the disks 97 and their carried parts, in the'directionindicated by the arrow just referred to. As the disks 97 and theircarried parts (forming the crushing and grinding mechanism) rotate inthe direction indicated, the arms 122 will engage the plunger 85 andcause it, through the mediun of the lever 80 to operate thereciprocating feed plate 60, to cause the material to be pushed downwardtoward the anvil portion 27 of the die 26 onto which it is deposited asthe feed plate 60 starts on its return move-- ment, by reason of thepivoted gate 75 in a manner similar to that in my patent hereinbeforereferred to. Just after the material has been dumped onto the anvilportion 27 of the die 26, one of the hammers 103, strikes such material,and crushes the same. The materialthen finds its way down on the curvedface of the die where it is pulverized by the further action of'thehammers, in a manner similar to that in my patent hereinbefore referredto. As the disks 97 and their carried parts rotate, the centrifugalforce of the grinding hammers is augmented by the weight of thependulums 115, which are so arranged that their weight counter-balancesthe weight of the hammers when-the hammers are out of engagement withthe die, the pendulums 115 being so arranged that their cam portion 118will hold the same out of engagement with the hammer when it is in-itsstriking position.

In my patent before referred to, I have found that by 100 constructingthe machine in accordance therewith, in practice, it requires too muchpower to operate the machine, while by using the pendulums of my presentinvention, and arranging them as shown and described, the weight of thependulur'ns serve to counter-balance to a large extent, the weight ofthe hammers, so'that in a machine constructed in accordance with mypresent invention, only about one-fourththe power is required 7 tooperate the machine, while the capacity is much greater than in themachine disclosed in my patent before referred to. The pendulums assistthe ha v to throwout at a lower rate of speed than the ring of my patentbefore referred to, and fall away from the hammers while the hammers aregrinding, and add little or nopressure thereto. 4

The amalgam pockets are filled with mercurywhen, the machine is started,and water is introduced into the machine through the. apertures 12 inthe upper e n b which serve not alone to form the crushed material intopulp, but also serve to W out the bearings and prevent any possible dirtor grit t form therein, and hence enables a smoother runningof themachine than would be, otherwise possible. The precious metals in thepulp will be largely amalgamated in the amalgam pockets, while thosethat pass out through the screens 19 can' be amalgamated on the usualamalgam plates.

Themillcaiialsobeusedas'adrymillaswellasa wet mill, if desired, and byconstructing the hammers with shoulders 106, when the hea30 wear downcom- For small mills, the mortar may be made of a single piecexof wood,as shown in-Figs. 16- and 17, whereas in a'series of hammers carriedthereby andlament with the hammer when inits striking large mills it'ismade oi'cast metali The screens may be placed'at-anyangle desired andthe die-may be cast-in sections, as shown in my patent before referredto, for convenience of transportation overdifficult roads.

125 designates a cover for the mortar 1, which is made preferably, ofsheet metal reinforced bythe angle irons 126, as shown, and this coveris pivotally mounted at 127 to the mortar frame, as shown.

From the foregoing description, taken in connection with theaccompanying drawings, it is thought the complete construction,-operation and many ad vantages otmy invention-will be-readily apparentto those skilleddn the art to which it appertains.

What I claim is:- Y 1.- A quartz mill, comprising a mortar, a rotatableshaft, series of nor mally separated devices for coiiperating with saidham-- [nets to regulate their crushing and grinding action,substantially" as shownand described.

2. A quartz mill, .comprisinga-mortar; a rotatable shaft,

a series of=hammers carried thereby, normally separated meanscooperating with eaeh'hammer forcounterbalancing said hammers when intheirnon-operativeposition substantlally as shown and-described.

A quartz mil-1", comprising a mortar, a-rotatableshaft; :1series-ofhammers-carried thereby, means carried by the Shaftandcooperating with each hammer, for counter-bah ancing'the same when inits non-operative position, and:

then-regulating the centrifugal 'forceofsaid hammers at times,-substantially as shown anddescribed:

4; A quartzmil-h: comprising a mortar, a rotatable-shaft,

a series of hammers carried thereby, a series of pendulums' also carriedby said shaft for coiiperatingwlth said hammers, substantially as shownand described.-

5- III a quartz mill, the combination-withwtherotatable support, aseries-of-pi-votal hammers hung'thereon ona die having an anvil formedon the receiving end thereof and projected into the range of action ofthe striking faceof the hammers, meanswhereby the hammers after striking said anvil'tnrnnpon' their pivots and traveLover-the remainingsurfaces of=ths-di,e, .ndependent means foreachhammer carried by therotatable support, for regulating at? times, the centrifugal force ofthe hammers, and for counter-balancing the weight of said hammers attimes, sald' independent means being arranged to be-out of'engagemeansfor feeding ore upon the anvil.=

6. In an apparatus ing arr-anvilface, a mortar. a series ofplvotallymounted hammers carried by said drive shaft and. aseries of pivotallymounted 'pendu lums also carried by said drive shaft for cooperatingwith said hammers, and means for feedingore onto the anvil,substantially as shown and described.

7. A quartz mill; comprising a mortarhaving sa. concaved working face, arotatable shaft, a series of hammers carried thereby, a series ofpendulums also carried by the shaft-for coiiperating with the hammers;and means for feeding ore to said anvil.

-8. In an apparatus of the class described, a pounding I ets, one'endof-said-die forming an anvil, a shaft position, andof the classdescribed, comprising in combination, a mortar, a die held 'in said'mortar, and havdrive shaft adjustably. held in said 1 seems:

and.grinding mechanism comprising a rotatable shaft, :1 pair 'of disksparallelly-arranged on said shaft, and spaced apart, a plurality ofhammers pivotally supported between said'disks in radial alinement withthe shaft, a plurality of pendulums, one for each hammer, pivotallymounted between said disks, a plurality, of-lugs carried by said disksand ears carried by said hammers for engaging said lugs, substantiallyas shown and described.

9. In an apparatus of the class described, a mortar having a: concuvedworking face; a" die held therein, said die having an anvil portion,said mortarhaving a plurality of amalgampockets, said mortar, means-forintermittently feeding ore to said die anvil portion, a-rotatab'e shaft,:1 series of hammers pivotally curried thereby adapted to strikesaidanvil portion-and be carried'around-in engagement with the concavedfaceof the die, means for limiting the'pivotal movement of said hammers,and independent means for each hammer for cooperating therewith tocounter-balance the same when in oneposition, to regulate the weight ofthe hammers'as their sngularity decreases and to remain out of contactwith said hammers when in their striking positions, substantially asshown and described.

10. In a quartz mil], the combination of a mortar having amalgampockets, 2. die having lugs to enter saidpockmounted over-said mortar,and hammers. carried by said shaft and adapted to coact with the anvil,substantially as shown and described.

11. In a quartz mill,- the combination of a mortar havingamalgam-pockets, a die having lugs to enter-such pockets, oneendofsaidrl-ie forming an anvil, ashaftmounted over said mortar, hammerscarried by said shaft and adapted to coact with theanvil, andindependent means caliperating with-each-hammer for regulating thecentrifugal force-thereof, substantially-as shown and described.

12. In a quartz'mill, the combination with-the mortar having sideopenings, screens detachably secured over said openings, troughs forsaid mortar, outside of said screens, said mortar being provided "with aseries of pockets, a-die mounted'in said mortar, a rotatable shaftmounted above said-die-and a-plurali-ty of'hammers carried by said shaftforcooperatingw-ith said die, substantially as shown and described.

13. In a mill, the combination-with a mortar, a rotary 'hnmmersupportand hammers pivoted thereon, said hammers havingtheir endsprovldedewith'stops, stops on said hammer support forcofiperating withthe hammer stops to limit the movement ofthe hammers about their pivots,means for'feeding ore to said mortar, said means including a: feedfchut,a reciprocating ore carrier, and means for moving said carriercotirdinate with: said I hammers, and means for adjusting said movingmeans, substantially as shown and described;

interlocking means between said die and 14. In a quartz mill, thecombination with a. rotatable support, of a piurali'ty-of hammerspivoted thereon, said hammers comprising-armsterminating inhead'receiving portions,-sald head receiving portions being apertured,de' tachable heads secure to said-head receiving portions and havingshanks for entering-the apertures thereof, said hammer arms beingprovided with shoulders at the ends thereof, pins passing through saidends'adjacent ,said shoulders, and-means on-thc rotatable member forcooperatingwitn-said pins to-llmit the pivotal motion of-the hammerssubstantially as shown and described.-

15.=-In= a mill of'the character described, a mortar having a concavedportion, a die held in said concaved portion,

said die having an anvilend and a grinding surface, a

shaft rotatably mounted above said die, means for adjustlng snidshaft'toward or from said die, a plurality of pivotally mounted hammerscarried by said shaft, means for' limiting the pivotal motion ofsaid'hammers, independent'means coiiperating with each hammer-forcounterbalancing the centrifugalforce thereof, a hopper and a feedtrough, a reciprocating plate for said feed trough,

means controlled by the rotation of said shaft for reciprocating saidfeed plate, said last nimed means in-' 'cluding a reciprocating plunger,means for adjusting said plunger with respect to said shaft, andmeans'for ad-.

mitting water into the interior of the mortar through the bearings ofthe shaft, substantially as shown and de scribed.

16, A hammer for quartz mills, comprising a head re ceiving portion, anarm projecting at right angles thereto, said hammer having a shoulder atthe juncture of the head receiving portion with the arm, a detachablehead tion with the mortar, and a die having an anvil portion and agrinding face, of a rotatable shaft supported above said die, a pair ofdisks mounted on and carried by said.

shaft, a plurality of hammers pivotally mounted between said disks,means for limiting the pivotal movement of said hammers, independentmeans coiiperating with each hammer "for controlling, the centrifugalforce thereof, substantially as shown and described.

18. An apparatus of the class described, comprising a mortar having aconcaved portion, amalgam pockets in the bottom and side walls of saidconcaved portion, outlet apertures in the side walls of said mortar,screens detachably held over said outlet apertures, a die held in saidconcaved portion of said mortar, and said die having an anvil portionand a grinding surface, said mortar having bearing receiving brackets,upper and lower bearing boxes held on said brackets, a shaft totatablymounted in said bearing. boxes, a plurality of hammers carried by saidshaft for cooperating with said die, means for admitting water into theinterior of the mortar through the bearing boxes, and means for feedingore into the entrant end of the mortar substantially as shown anddescribed. 19. An apparatus of the class described, comprising a, mortarhaving a concaved portion, amalgam pockets in the bottom and side wallsof said concaved portion, an outlet apertures in the side walls of saidmortar, screens detachably held over said outlet apertures, a die heldin said concaved portion of said mortar, and said die having an anvilportion and a grinding surface, said mortar having bearing receivingbrackets, upper and lowerbearing boxes held on said brackets, a shaftrotatably mounted in said bearing boxes, a plurality of hammers, carriedby said shaft for codperating with said die, means for admitting waterinto the interior of the mortar, through the bearing boxes, means forfeeding ore into the entrantend of the mortar, and means interposedbetween the lower bearing boxes and the brackets for spacing the shaftat a greater or less distance from the die, substantially as shown anddescribed.

20. In an apparatus of the class described, the combination with amortar, a crushing and grinding mechanism therefor, of feed mechanismcomprising a feed trough secured to the entrant end of the mortar, ahopper secured above the feed trough to discharge therein, a feed platecarried by the feed trough for moving the ore toward the mortar, apivoted gate at the entrant end of the mortar for coiiperating with saidfeed plate, said feed plate hav- "ing a raised portion, a coil springheld in said raised portion, and connected thereto, an adjusting screwconnected to the other end of said coil spring and passing through theframe of the machine, an adjusting nut on said screw for adjusting thetension of said coil spring and means controlled by the crushing andgrinding mechanism for moving said feed plate in one direction,substantially as shown and described.

21. In an apparatus of the class described, the combination with amortar, a crushing and grinding mechanism therefor, of feed mechanismcomprising a feed trough, secured to the entrant end of the mortar, ahopper secured above the feed trough to discharge therein, a feed platecarried by the feed trough for moving the ore toward the mortar, apivoted gate at the entrant end of the mortar for coiiperating with saidfeed plate, said feed plate having a raised portion, a coil spring heldin said raised portion and connected at one end thereto, an adjustingscrew connected to the other end of said coil spring and passing throughthe frame of the machine, an adjusting nut on said screw for adjustingthe tension of said coil spring, means controlled by the crushing andgrinding mechanism-for moving said feed plate in one 'direction,

said last named means comprising a pivoted lever'having one end adaptedto abut the feed plate, a plunger secured to the other end of saidlever, and means carried by the operating shaft of the crushing andgrinding mechanism for reciprocating said plunger, and a buffer forretarding l the rebound of said lever, substantially as shown anddescribed.

22. In an apparatus of the class described, the combination with amortar, rotatable crushing and grinding mechanism carried thereby, andincluding a rotatable drive shaft,'of feeding mechanism for feeding oreto said mortar, comprising a hopper, a. feed trough thereunder inconnection with the entrant end of the mortar, a reciprocable feed platecarried by the trough, a pivot lever for reciprocating said feed plate,a plunger connected .with said lever and projected downwardly toward theshaft, :1 pluraiity of radial arms carried by the shaft for engagingsaid plunger to reciprocate the same, an adjusting block throughwhichsaid plunger passes, an elongated bearing member carried by the mortarfor receiving said adjusting block, and a screw passing through saidbearing member and adjusting block for moving the bearing'member toadjust the plunger, substantially as shown and described.

CHARLES E. HUMPHREYS.

Witnesses H. J. BARTON,

Gno. C. Bonnnronn-

